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Experimental study of heat transfer characteristics of round air jet impinging on convex surface

Muhalhal, Hasan Abduallatif (2014) Experimental study of heat transfer characteristics of round air jet impinging on convex surface. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

An experimental study has been carried out for jet impingement cooling on a semicircular convex surface when jet flows were ejected from single round nozzle. An experimental investigation is performed to study the effects of jet-to-surface spacing and Reynolds number on the local heat transfer distribution between an convex surface and impinging circular air jet. Experiments have been conducted with variations of nozzle exit Reynolds number is Re= 11000, 23000 and 50000, and nozzle to surface distance is Wd= 1, 2, 6, and 10 to determine the heat transfer Coefficients under a constant heat flux condition. The results showed that the heat transfer coefficient h is higher at the stagnation region and decrease gradually at outlet region. The heat transfer coefficients increases by increasing Reynolds number and increases with Lld and reaches a maximum of Lld = 6 at Re = 11,000 and 23,000, and at Lld = 8 for Re = 50,000, respectively. Average heat transfer rates for impingement on the convex surface are found to be more enhanced than the flat plate results due to the effect of curvature. Comparisons between the present results and the existing experimental results have also been made.

Item Type: Thesis (Masters)
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ255-265 Heat engines
Depositing User: Normajihan Abd. Rahman
Date Deposited: 30 Apr 2015 01:40
Last Modified: 30 Apr 2015 01:40
URI: http://eprints.uthm.edu.my/id/eprint/6720
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